package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

public class JDBCDemo6 {
    public static void main(String[] args) {
        try(
                Connection connection = DBUtil.getConnection();
                ){
            Statement statement = connection.createStatement();
            String sql = "SELECT COUNT(*) count "+
                    "FROM class c "+
                    "JOIN student s ON c.id=s.class_id "+
                    "WHERE c.name='1年级1班'";
            ResultSet resultSet = statement.executeQuery(sql);
            while (resultSet.next()){
                int count = resultSet.getInt("count");
                System.out.println(count);
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
